Double lock for doors



Nov. 20, 1928. 1,692,663

T. H. JOSEPH DOUBLE LOOK FOR DOORS Filed April v, 1927 Sheets-Sheet 1 Z? l f 2 I I Y W a x r/ I j m M, i ii m 5" /7 I /4 W TN E55 INVENTOR 7TH. dos/57 w ZTTO (5 Nov. 20, 1928. 1,692,663

T. H. JOSEPH DOUBLE LOCK FOR DOORS "le d April 1927 3 Sheets-Sheet WITN E55 f 7? H. 16%??? $66M 5 Patented Nov. 20, 1928.

UNITED STA res PATENT" OFFICE.

THEODORE H. JOSEPH, OF NEW YORK, N. Y., ASSIGNOR IO THE SILENT WATC'HMAN CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

DOUBLE LOOK FOR DOORS.

Application filed April 7, 1927. Serial No. 181,883.

This invention relates to double locks for doors where it is desired to have the locks operatable only in a certain sequence. Such locks have a particular use in connection with time recording devices that keep a record. of the time that one of the locks is opened or closed. It is desired in such cases that the recording lock be prevented from being unlocked unless the other look is first unlocked or that the recording lock shall be locked before the other lock is locked.

It is old as shown in Patent No. 1,281,536 of October 15, 1918, to employ separate locks with separate keepers applied independently to the door and jainb. Such separate locks do not always permit accurate and per manent cooperation between the two locks. They furthermore require an initial move-' ment of the door to effect the unlocking.

The object of the present invention isto combine the two locks into one device whereby the sequential operation of the locks can be effected without movement of the door and with greater accuracy and permanency. A further object is to enable the sequential operation to be performed by a single key.

Thev invention comprises the combination with two associated cooperating locks of interlocking means between the loiks whereby the locks can only be operated in a given sequence in locking and in the reverse sequence when unlocking.

' The invention more specifically comprises a combination of two bolts, one of which has an'offset or projection that, extending behind a part of the other bolt, insures that the bolts can only be moved in the desired sequence.

The invention further comprises a combination of two bolts with key operated means adapted to throw and retract the bolts in proper succession.

Embodiments of my invention are illustrated in the accompanying drawings, in which 6 Figure 1 is a front view of my improved 1ock,'with the cover removed, showing the application of the lock to a time recording mechanism.

Figure 2 is a side elevation of the lock.-

Figure 3 is a horizontal sectional View on the line 3-3 of Figure 1.

Figure 4 is a vertical sectional view on the line 44 of Figure 1.

Figure?) is a front View of the lock applied to a door. 1

Figures 6 and 7 are sections through the lock on lines 66 and 77 of Figure 5.

Figure 8 is a front View with the cover removed of a modification.

Figure 9 is a side view of the same applied to a door. I

Figure 10 is a front View in partial sec? tion, showing the interlocking feature applied to the keeper.

Figure 11 is a section on line 11-11 of Figure 10. v

Figure 12 is a'view similar to Figure 10, with the interlocking device in its locked position.

Figure 13 is a section on line 13-13 of Figure 12. p

eferriug first to Figures 1 and 2, a lock case is shown at 14, in which are slidably mounted two bolts 15 and, 16. The bolts have individual key members 17 and 18,

which may, for example, be as shown in the form of crank arms mounted on the barrels of ordinary cylinder locks. Adjacent the lock case 1 1- is a time recording mechanism 19 which is adapted to make a record of the times when the bolt 15 is locked or unlocked. In such combinations of time recording mechanism and double looks, it is desired that the lock connected directly with the re:ording mechanism shall be thrown into.

the locked position before the second bolt is locked and that the second bolt shall be withdrawn from the locked position before the time recording bolt is withdrawn, the object being to prevent an operative throwing the time recording mechanism into an open door position unless the door is entirely unlocked. In the present invention, this is accomplished by having a portion 20 of the common lock bolt 16 projecting to the rearward of a portion 21 on the bolt that is to take precedence in the locking operation so that the latter will have to be thrown into the locked position before the former can be moved. In unlocking, the reverse sequence takes place, namely the'common bolt must be thrown back before'the other bolt can be retracted. In this intermediate stage, the two bolts occupy the respective positions shown in Figures 5, 6 and 7 when the common bolt 16 has been withdrawn while the other bolt is in position to be withdrawn;

In Figures 8 and 9 I have showna modification of the invention in which the two bolts 15 and 16 are adapted to be operated by a single key member 17 which operates directly on the bolt 15 in an initial turn to throw the bolt into the locked position and then upon itscontinuing rotative motion by engaging with a rocking member 22 ivoted at 23 is enabled to throw the second olt 16 into the locked position. Conversely when the key member 17 is turned in the opposite direction, itwill first engage the member 22 to throw the bolt 16 into the unlocked position and thenby continuing rotative motion in the same direction will finally throw the bolt 15 into the unlocked position. In this way, with a single key a proper sequence in the operation of the two bolts is insured. It is still desirable, however, to have a portion 20 of the bolt 16 adapted to engage rear ward of a portion 21 0f the bolt 15, as otherwise by jarring, or improper interference,

the proper sequence might be inverted. The bolts 15 and 16 have the usual slotted por tions 24 and 25 with which the operating members 17 and 22 engage.

With two bolts operating in sequence, as above described, it is possible to provide means for transversely locking one of the bolts to the keeper to make a positive lock opposing any tendency to pry the door: away from the jamb or the lock away from the keeper. In Figures 10 to 13 I have shown such a device. It consists essentially of a transverse locking member 26 which is shown as a dog pivoted at 27 in the keeper. The

belt 15 which is thrown into the keeper before the bolt 16, has a notch shown at 28,

into which the dog 26 may be forced. This introduction of the dog 26 into the notch 28 is effected after the bolt 15 is thrown into the keeper, when the bolt 16 is also so thrown into the keeper, the bolt 16 impinging against the shoulder of the dog to throw the same up.

into the notch, as clearly shown in Figure 12. l Vhen in this position the dog will hold the bolt 15 firmly in the keeper in opposition to any force tending to pry the keeper away from the lock. A bridge 29 in the keeper is adapted to take the strain off the dog, should such an effort be made. In unlocking, the dog will fall by gravity out of the notch 28. To make such retreat of the dog )ositive, I provide a notch as shown at 30 in the bolt 16, the shoulder of which will engage with a heel 31 on the dog when the bolt 16 is retracted, to forcibly compel the dog to retreat from the notch 28.

While I have shown specific embodiments of my invention, it is to be understood that the following claims are intended to cover any modifications having the same functions.

I claim 1. The combination comprising a lock case,

first and second lock bolts slidably mounted in the case, a portion of the first bolt adapted to engage forward of a partof the second bolt and a key operated member adapted to throw the bolts into locked engaging with and locking t first bolt and position by first then engaging with and locking the second bolt. 7

The combination comprising a lock case, two lock bolts slidably mounted in the case, a key operated member adapted to engage with one bolt to throw said bolt into its locked posit-ion, a member adapted to engage with the other bolt to throw it into its locked position, i

the latter member being adapted to be operated by the key operated member after the key operated member has thrown the first mentioned bolt.

3. The combination comprising a lock case, two bolts slidably mounted in said case, a

rotating key operated member adapted to engage one of the bolts to throw it byan initial turn of the key operated member, and a bolt throwing member for the other bolt, said latter member being adapted to engage with the key operated member on the further rotation of the key operated member after it has completed the throwing of the first bolt,

r 4. The combination comprising a timerecording mechanism, a lock case, a bolt slidably mounted in the case, means connecting said bolt to the recording mechanism, a key operated member adapted to operate the said bolt, a second bolt slidably mounted in the case and provided with means for preventing the unlocking of the first bolt until the second bolt is unlocked.

THEODORE H. JOSEPH. 

